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Voltage/Length (fwd)
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From: Greg Leyh [SMTP:lod-at-pacbell-dot-net]
Sent: Monday, February 09, 1998 4:20 AM
To: Tesla List
Subject: Re: Voltage/Length (fwd)
Alfred A. Skrocki wrote:
> > > It should be noted that using the equation
> > > Vs = Vp sqrt(Cp/Cs)
> > > can give incorrect results when applied to Tesla coils.
>
> The above is wrong because it does not consider the fact that the
> equation Vs = Vp sqrt(Cp/Cs) refers to the distributed or parallel
> secondary capacitance. The toroidal capacitance is in SERIES with the
> secondary and actually decreases the total secondary capacitance and
> this is why adding a toroid usually increases a coils output.
>
> Ctotal = 1/(1/Csecondary + 1/Ctoroid)
Interesting idea, but it seems to me that the
electric field lines from the secondary winding
that form its sheet capacitance go directly from
the winding to ground. The field lines from an
added toroid also go ground and out into space,
which implies that its capacitance effectively
acts in parallel.
Also, its easily demonstrated that adding a
toroid decreases Fsec, indicating that the toroid
has either increased the total Lsec or Csec.
It might be possible to add a toroid that is so
huge and hangs so low that it shields the secondary
from ground, thereby reducing its self-capacitance,
but this would be far from a practical system.
-GL